Non-detachable insulator.



H. BARTLETT 9 A. P.'MAQGALLUM.,

NON-DETAGHABLE INSULATOR 4APPLIMTION FILED MAY 12, 1909.

987,140. Patented 901;. 19,1909.

UNiTnii sTATEs PATENT OFFICE.

HARRY BAnTLET'r AND ALEXANDER P. MaccALLUM, or ALBUQUERQUE, TERRITORY" OF NEW MEXICO.

NON-DETACHABLE INSULATOR.

i, adapting the insulator to be readily and tional quickly connected with the supporting pin or .shank in such manner that a reliable interlocked engagement between the body of the insulator and the pin or shank will be obtained which will efectually guard against the removal of the insulator'.

A further object of the invention is to provide means for compensating for the eX` pansi'on and contraction of-the pin due to atmospheric changes.

Vith the above'and other objects in View, the nature of which will more fully appear as the description proceeds, the inventionconsists in the novel construction, combination and arrangement of parts as hereinv fu'lly described, illustrated and claimed.

In the accompanying drawings :Figure 1 is a vertical sectional view of anV insulator embodying the present invention, showing the pin or shank in section. Fig. -2 is an enlarged View in elevation of the pin or shank. Fig. 3 is a cross section through' Fig. 2, taken on the line 3-3L Fig'. 4 isa vertical. secj view of an inverted form of insulator body.

The insulator in the preferred form thereof comprises a conoidal bodyjl, or in other words, abody of the usual petticoat form, the 'same being provided with a bore 2 eX- tending .from the lower and larger end thereof and terminating short of-the extremity ot' the body, as shown in 'Fig l.

In carrying outthe present invention, the bore 2 is of irre ular cross section and preferably octagonaI, as indicated in Fig. 3 to receive :t `corresponding shaped portion of 'the pin or shank.

The pin or'shan'kcomprises a cylindrical portion 3 which isA screw-threaded at its ower extremity as shown at 14. to receive a retaining nut the latter .not being shown.

At suitable distances from the threaded end Specification of Letters Patent. v Patented Oct, 199 1909, Application *filed May 12, 1908. Serial No. 432,407.

the pin or shank is provided with ahshoulder 5 adapted to rest against the usual cross arm, the cylindrical portion 3 of the shank passing through the cross arm and being.

held by'a'n'ut placed on the threaded end 4. The upper portion of the shank'or pin is preferably of octagonal shape in cross section as shown at 6 so as to end within the octagonal bore of the insulator body l and t0 the pin or shank.

Extending from the upper extremity of the pin downward to a point near the shoulder 5 is a longitudinal slot 7 of sufficient width to provide for the expansion and contraction of the pin due to atmospheric changes. The pin is also provided with mortises 8 extending inward from opposite sides thereof and at right angles to the slot 7, said inortises being designed to receive the in-bent extremities 9 of a pair of locking springs l() which project on opposite sides prevent the insulator from turning relative of the pin and incline downwardly and outwardly therefrom as clearly shown in Figs. 1 and 2, the adjacent sides of the portion 6 of the pin being recessed as shown at l1 to allow the projecting portions of the spring to be deflected within the plane of the outer surface of the pin to permit the insulator body to be slipped over the upper end of the pin in a manner illustrated in Fig. l.

The bore`2 of the insulator body is vprovided with lateral extensions or enlargements 1Q to receive the springs 10 and in forming the extensions l2, angular shoulders 13 are at the same time provided against which the extremities of the springs l0 are adapted to bear when the insulator body has been forced to its forward position on the pin as shown in Fig. l, thus preventing the vinsulator from being detached from the pin.

In Fig. t We have illustrated an inverted form of insulator embodying, however, the same principle as that shown in Fig. l. The insulator of Fig. 4vis, however, of a general cylindricalform With the upper sloping or bevel surface 14 to insure the 'draining of water therefrom and a drain hole or orifice 15 is provided centrally in the bottom of` said insulator Which extends from the bottomlof the insulator into the enlarged portion of the bore so as to admit of the ready escape f any water which may find its way into the bore of the insulator. The insulator vprevents the accumulation of rain or SleetJ which is often the canse of short eircuiting. rlhc pin or shank oi the insulator will ordinarilyY he galvanized or coated in auch inanneras to prevent corrosion oi the metal from any ot' the ordinary causes.

.fin insulator provided with a bore defined by a plurality of itat Walls and also formed with a 'miete-conical cavity coini'nui'iicating with said bore and of sutlieiently greater diameter than said bore to form oppositely arranged shonldere within the insulator body, in combination with a pin or Shank having a portion tl'iereot` shaped in crose section to correspond with the shape el and till the here olf the insulator and having" one end thereoi1 tapered, and 'rewrsely inclined springs fastened to the tapered extremity of Said pinl and adapted to snap into inteillocked engagement with Said Slrauldcrs in the insulator bore when the insulator body is pnehed upon the'fpin or shank, substantially as described.,

in testimony whereof we ali tures in presence of two "tvitnem,

l-lillfa ifil'liillft. A LIQLNDER i?. ldaotfiLLUiai.

XWitnesses:

VV'. N. Dv'loGtrGlrz, J. H. SixmrLnnorim.

our Signa- 

